﻿using System.Text;
using System;
using System.Collections.Generic;
using System.Web.Mvc;
using Pulog.Models;
using System.Linq;
using System.Configuration;
using System.Text.RegularExpressions;
using System.Web;

public static class Helper
{

    #region Settings
    public static int PageSize
    {
        get
        {
            return Int32.Parse(ConfigurationManager.AppSettings["PageSize"]);
        }
        set
        {
            ConfigurationManager.AppSettings["PageSize"] = value.ToString();
        }
    }

    public static string BlogName
    {
        get
        {
            return new Pulog.Models.SettingRepository().GetSettingByKey("BlogName");
        }
    }
    public static string BlogDescription
    {
        get
        {
            return new Pulog.Models.SettingRepository().GetSettingByKey("BlogDescription");
        }
    }
    public static string BlogURL
    {
        get
        {
            return new Pulog.Models.SettingRepository().GetSettingByKey("BlogURL");
        }
    }
    public static string AttachmentPath
    {
        get
        {
            return new Pulog.Models.SettingRepository().GetSettingByKey("AttachmentPath");
        }
    }
    public static int MaxCommentLevel
    {
        get
        {
            int maxCommentLevel = 3;
            if (!Int32.TryParse(new Pulog.Models.SettingRepository().GetSettingByKey("MaxCommentLevel"), out maxCommentLevel))
            {
                maxCommentLevel = 5;
            }
            if (maxCommentLevel < 3)
            {
                maxCommentLevel = 3;
            }
            return maxCommentLevel;
        }
    }
    #endregion


    public static string GetDateDifference(DateTime time)
    {
        TimeSpan ts = DateTime.Now.Subtract(time);
        StringBuilder sb = new StringBuilder("");
        if (ts.Days == 0 && ts.Hours == 0 && ts.Minutes == 0)
        {
            return sb.Append("刚刚发表").ToString();
        }
        else
        {
            if (ts.Days != 0)
            {
                sb.Append(ts.Days);
                sb.Append("天");
            }
            if (ts.Hours != 0)
            {
                sb.Append(ts.Hours);
                sb.Append("小时");
            }
            if (ts.Minutes != 0)
            {
                sb.Append(ts.Minutes);
                sb.Append("分钟");
            }
            sb.Append("前");
        }
        return sb.ToString();
    }

    public static List<SelectListItem> GetYesNoSelectedListItem()
    {
        List<SelectListItem> list = new List<SelectListItem>()
        {   new SelectListItem()
            {
                Text="Yes",Value="1"
            },
            new SelectListItem()
            {
                Text="No",Value="0",Selected=true
            }
        };
        return list;
    }

    public static List<SelectListItem> GetPropertyListIem()
    {
        List<SelectListItem> list = new List<SelectListItem>()
        {
            new SelectListItem()
            {
                Text ="Published",Value="0", Selected=true
            },
            new SelectListItem()
            {
                Text="Locked", Value="1"
            },
            new SelectListItem()
            {
                Text="Hidden", Value="2"
            }
        };

        return list;
    }

    public static List<SelectListItem> GetCategoryListItem()
    {
        List<SelectListItem> list = new List<SelectListItem>();
        SelectListItem item = new SelectListItem();
        foreach (Pulog.Models.Category c in new Pulog.Models.CategoryRepository().GetAllCategories())
        {
            item = new SelectListItem();
            item.Text = c.categoryName;
            item.Value = c.categoryID.ToString();
            list.Add(item);
        }

        return list;
    }

    //public static string GetTagsForPost(Pulog.Models.Post p)
    //{
    //    string s = "";
    //    foreach (PostTag pt in p.PostTags.ToList())
    //    {
    //        s += pt.Tag.TagName + ", ";
    //    }
    //    return s;
    //}

    public static string GetProperURL(string url)
    {
        if (!string.IsNullOrEmpty(url) && url.StartsWith("http://", StringComparison.OrdinalIgnoreCase))
        {
            return url;
        }
        else
        {
            return "http://" + url;
        }
    }

    public static string ReplaceAllowedHTML(string input)
    {
        StringBuilder sb = new StringBuilder(input);

        sb.Replace("&lt;b&gt;", "<b>");
        sb.Replace("&lt;/b&gt;", "</b>");

        sb.Replace("&lt;i&gt;", "<i>");
        sb.Replace("&lt;/i&gt;", "</i>");

        sb.Replace("&lt;p&gt;", "<p>");
        sb.Replace("&lt;/p&gt;", "</p>");

        return sb.ToString();
    }

    public static string TransStringTool(string aTransString)
    {
        string returnString = "";
        aTransString = aTransString.Replace("&", "&amp;");
        aTransString = aTransString.Replace("<", "&lt;");
        aTransString = aTransString.Replace(">", "&gt;");
        aTransString = aTransString.Replace(" ", "&nbsp;");//空格
        aTransString = aTransString.Replace("\n", "<br>");//回车

        returnString = aTransString;
        return returnString;

    }

    public static string GetMD5Hash(string input)
    {
        //System.Security.Cryptography.MD5CryptoServiceProvider x = new System.Security.Cryptography.MD5CryptoServiceProvider();
        //byte[] bs = System.Text.Encoding.UTF8.GetBytes(input);
        //bs = x.ComputeHash(bs);
        //System.Text.StringBuilder s = new System.Text.StringBuilder();
        //foreach (byte b in bs)
        //{
        //    s.Append(b.ToString("x2").ToLower());
        //}
        //string password = s.ToString();
        //return password;

        return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(input, "Md5");
    }

    public static string UbbToHtml(string str)
    {
        str=TransStringTool(str);

        //Regex my=new Regex(@"(\[IMG\])(.[^\[]*)(\[\/IMG\])",RegexOptions.IgnoreCase);
        //str=my.Replace(str,@"<a href=""$2"" target=_blank& gt;<IMG SRC=""$2"" border=0 alt=按此在新窗口浏览图片 onload=""javascript:if(this.width>screen.width-333)this.width=screen.width-333""></a>");

        //my=new Regex(@"\[DIR=*([0-9]*),*([0-9]*)\](.[^\[]*)\[\/DIR]",RegexOptions.IgnoreCase);
        //str=my.Replace(str,@"<object classid=clsid:166B1BCA-3F9C-11CF-8075-444553540000 codebase=http://download.macromedia.com/pub/shockwave/cabs/director/sw.cab#version=7,0,2,0 width=$1 height=$2><param name=src value=$3><embed src=$3 pluginspage=http://www.macromedia.com/shockwave/download/ width=$1 height=$2></embed></object>");

        //my=new Regex(@"\[QT=*([0-9]*),*([0-9]*)\](.[^\[]*)\[\/QT]",RegexOptions.IgnoreCase);
        //str=my.Replace(str,@"<embed src=$3 width=$1 height=$2 autoplay=true loop=false controller=true playeveryframe=false cache=false scale=TOFIT bgcolor=#000000 kioskmode=false targetcache=false pluginspage=http://www.apple.com/quicktime/>");

        //my=new Regex(@"\[MP=*([0-9]*),*([0-9]*)\](.[^\[]*)\[\/MP]",RegexOptions.IgnoreCase);
        //str=my.Replace(str,@"<object align=middle classid=CLSID:22d6f312-b0f6-11d0-94ab-0080c74c7e95 class=OBJECT id=MediaPlayer width=$1 height=$2 ><param name=ShowStatusBar value=-1><param name=Filename value=$3><embed type=application/x-oleobject codebase=http://activex.microsoft.com/activex/controls/mplayer/en/nsmp2inf.cab#Version=5,1,52,701 flename=mp src=$3  width=$1 height=$2></embed></object>");

        //my=new Regex(@"\[RM=*([0-9]*),*([0-9]*)\](.[^\[]*)\[\/RM]",RegexOptions.IgnoreCase);
        //str=my.Replace(str,@"<OBJECT classid=clsid:CFCDAA03-8BE4-11cf-B84B-0020AFBBCCFA class=OBJECT id=RAOCX width=$1 height=$2><PARAM NAME=SRC VALUE=$3><PARAM NAME=CONSOLE VALUE=Clip1><PARAM NAME=CONTROLS VALUE=imagewindow><PARAM NAME=AUTOSTART VALUE=true></OBJECT><br><OBJECT classid=CLSID:CFCDAA03-8BE4-11CF-B84B-0020AFBBCCFA height=32 id=video2 width=$1><PARAM NAME=SRC VALUE=$3><PARAM NAME=AUTOSTART VALUE=-1><PARAM NAME=CONTROLS VALUE=controlpanel><PARAM NAME=CONSOLE VALUE=Clip1></OBJECT>");

        //my=new Regex(@"(\[FLASH\])(.[^\[]*)(\[\/FLASH\])",RegexOptions.IgnoreCase);
        //str=my.Replace(str,@"<OBJECT codeBase=http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=4,0,2,0 classid=clsid:D27CDB6E-AE6D-11cf-96B8-444553540000 width=500 height=400><PARAM NAME=movie VALUE=""$2""><PARAM NAME=quality VALUE=high><embed src=""$2"" quality=high pluginspage='http://www.macromedia.com/shockwave/download/index.cgi?P1_Prod_Version=ShockwaveFlash' type='application/x-shockwave-flash' width=500 height=400>$2</embed></OBJECT>");

        //my=new Regex(@"(\[ZIP\])(.[^\[]*)(\[\/ZIP\])",RegexOptions.IgnoreCase);
        //str=my.Replace(str,@"<br><IMG SRC=pic/zip.gif border=0> <a href=""$2"">点击下载该文件</a>");

        //my=new Regex(@"(\[RAR\])(.[^\[]*)(\[\/RAR\])",RegexOptions.IgnoreCase);
        //str=my.Replace(str,@"<br><IMG SRC=pic/rar.gif border=0> <a href=""$2"">点击下载该文件</a>");

        //my=new Regex(@"(\[UPLOAD=(.[^\[]*)\])(.[^\[]*)(\[\/UPLOAD\])",RegexOptions.IgnoreCase);
        //str=my.Replace(str,@"<br><IMG SRC=""pic/$2.gif"" border=0& gt;此主题相关图片如下：<br><A HREF=""$3"" TARGET=_blank>< IMG SRC=""$3"" border=0 alt=按此在新窗口浏览图片 onload=""javascript:if(this.width>screen.width-333)this.width=screen.width-333""></A>");

        //Regex my= new Regex(@"(\[URL\])(http:\/\/.[^\[]*)(\[\/URL\])",RegexOptions.IgnoreCase);
        //str=my.Replace(str,@"<A HREF=""$2"" TARGET=_blank>$2</A>");

        //my=new Regex(@"(\[URL\])(.[^\[]*)(\[\/URL\])",RegexOptions.IgnoreCase);
        //str=my.Replace(str,@"<A HREF=""http://$2"" TARGET=_blank>$2</A>");

        //my=new Regex(@"(\[URL=(http:\/\/.[^\[]*)\])(.[^\[]*)(\[\/URL\])",RegexOptions.IgnoreCase);
        //str=my.Replace(str,@"<A HREF=""$2"" TARGET=_blank>$3</A>");

        //my=new Regex(@"(\[URL=(.[^\[]*)\])(.[^\[]*)(\[\/URL\])",RegexOptions.IgnoreCase);
        //str=my.Replace(str,@"<A HREF=""http://$2"" TARGET=_blank>$3</A>");

        //my=new Regex(@"(\[EMAIL\])(\S+\@.[^\[]*)(\[\/EMAIL\])",RegexOptions.IgnoreCase);
        //str=my.Replace(str,@"<A HREF=""mailto:$2"">$2</A>");

        //my=new Regex(@"(\[EMAIL=(\S+\@.[^\[]*)\])(.[^\[]*)(\[\/EMAIL\])",RegexOptions.IgnoreCase);
        //str=my.Replace(str,@"<A HREF=""mailto:$2"" TARGET=_blank>$3</A>");

        //my=new Regex(@"^(HTTP://[A-Za-z0-9\./=\?%\-&_~`@':+!]+)",RegexOptions.IgnoreCase);
        //str=my.Replace(str,@"<a target=_blank href=$1>$1</a>");

        //my=new Regex(@"(HTTP://[A-Za-z0-9\./=\?%\-&_~`@':+!]+)$",RegexOptions.IgnoreCase);
        //str=my.Replace(str,@"<a target=_blank href=$1>$1</a>");

        //my=new Regex(@"[^>=""](HTTP://[A-Za-z0-9\./=\?%\-&_~`@':+!]+)",RegexOptions.IgnoreCase);
        //str = my.Replace(str,@"<a target=_blank href=$1>$1</a>");

        //my=new Regex(@"^(FTP://[A-Za-z0-9\./=\?%\-&_~`@':+!]+)",RegexOptions.IgnoreCase);    
        //str = my.Replace(str,@"<a target=_blank href=$1>$1</a>");

        //my= new Regex(@"(FTP://[A-Za-z0-9\./=\?%\-&_~`@':+!]+)$",RegexOptions.IgnoreCase);
        //str = my.Replace(str,@"<a target=_blank href=$1>$1</a>");

        //my=new Regex(@"[^>=""](FTP://[A-Za-z0-9\.\/=\?%\-&_~`@':+!]+)",RegexOptions.IgnoreCase);
        //str = my.Replace(str,@"<a target=_blank href=$1>$1</a>");

        //my= new Regex(@"^(RTSP://[A-Za-z0-9\./=\?%\-&_~`@':+!]+)",RegexOptions.IgnoreCase);
        //str = my.Replace(str,@"<a target=_blank href=$1>$1</a>");

        //my= new Regex(@"(RTSP://[A-Za-z0-9\./=\?%\-&_~`@':+!]+)$",RegexOptions.IgnoreCase);
        //str = my.Replace(str,@"<a target=_blank href=$1>$1</a>");

        //my=new Regex(@"[^>=""](RTSP://[A-Za-z0-9\.\/=\?%\-&_~`@':+!]+)",RegexOptions.IgnoreCase);
        //str = my.Replace(str,@"<a target=_blank href=$1>$1</a>");

        //my=new Regex(@"^(MMS://[A-Za-z0-9\./=\?%\-&_~`@':+!]+)",RegexOptions.IgnoreCase);
        //str = my.Replace(str,@"<a target=_blank href=$1>$1</a>");
        //my= new Regex(@"(MMS://[A-Za-z0-9\./=\?%\-&_~`@':+!]+)$",RegexOptions.IgnoreCase);
        //str = my.Replace(str,@"<a target=_blank href=$1>$1</a>");

        //my=new Regex(@"[^>=""](MMS://[A-Za-z0-9\.\/=\?%\-&_~`@':+!]+)",RegexOptions.IgnoreCase);
        //str = my.Replace(str,@"<a target=_blank href=$1>$1</a>");

        //my=new Regex(@"(\[HTML\])(.[^\[]*)(\[\/HTML\])",RegexOptions.IgnoreCase);
        //str=my.Replace(str,@"<table width='100%' border='0' cellspacing='0' cellpadding='6' bgcolor=''& gt;<td><b>以下内容为程序代码:</b><br>$2</td>< /table>");

        //my=new Regex(@"(\[CODE\])(.[^\[]*)(\[\/CODE\])",RegexOptions.IgnoreCase);
        //str=my.Replace(str,@"<table width='100%' border='0' cellspacing='0' cellpadding='6' bgcolor=''& gt;<td><b>以下内容为程序代码:</b><br>$2</td>< /table>");

        Regex my = new Regex(@"(\[COLOR=(.[^\[]*)\])(.[^\[]*)(\[\/COLOR\])", RegexOptions.IgnoreCase);
        str=my.Replace(str,@"<font COLOR=$2>$3</font>");

        //my=new Regex(@"(\[FACE=(.[^\[]*)\])(.[^\[]*)(\[\/FACE\])",RegexOptions.IgnoreCase);
        //str=my.Replace(str,@"<font FACE=$2>$3</font>");

        //my=new Regex(@"(\[ALIGN=(.[^\[]*)\])(.*)(\[\/ALIGN\])",RegexOptions.IgnoreCase);
        //str=my.Replace(str,@"<div ALIGN=$2>$3</div>");

        //my=new Regex(@"(\[QUOTE\])(.*)(\[\/QUOTE\])",RegexOptions.IgnoreCase);
        //str=my.Replace(str,@"<table cellpadding=0 cellspacing=0 border=0 WIDTH=94% bgcolor=#000000 align=center><tr><td><table width=100% cellpadding=5 cellspacing=1 border=0><TR><TD BGCOLOR=''>$2</table></table><br>");

       // my=new Regex(@"(\[MOVE\])(.*)(\[\/MOVE\])",RegexOptions.IgnoreCase);
        //str=my.Replace(str,@"<MARQUEE scrollamount=3>$2</marquee>");

        //my=new Regex(@"\[GLOW=*([0-9]*),*(#*[a-z0-9]*),*([0-9]*)\](.[^\[]*)\[\/GLOW]",RegexOptions.IgnoreCase);
        //str=my.Replace(str,@"<table width=$1 style=""filter:glow(color=$2, strength=$3)"">$4</table>");

        //my=new Regex(@"\[SHADOW=*([0-9]*),*(#*[a-z0-9]*),*([0-9]*)\](.[^\[]*)\[\/SHADOW]",RegexOptions.IgnoreCase);
        //str=my.Replace(str,@"<table width=$1 style=""filter:shadow(color=$2, strength=$3)"">$4</table>");

        my=new Regex(@"(\[I\])(.[^\[]*)(\[\/I\])",RegexOptions.IgnoreCase);
        str=my.Replace(str,@"<i>$2</i>");

        my=new Regex(@"(\[U\])(.[^\[]*)(\[\/U\])",RegexOptions.IgnoreCase);
        str=my.Replace(str,@"<u>$2</u>");

        my=new Regex(@"(\[B\])(.[^\[]*)(\[\/B\])",RegexOptions.IgnoreCase);
        str=my.Replace(str,@"<b>$2</b>");

       // my=new Regex(@"(\[FLY\])(.[^\[]*)(\[\/FLY\])",RegexOptions.IgnoreCase);
       // str=my.Replace(str,@"<marquee onmouseover='this.stop();' onmouseout='this.start();'>$2</marquee>");

      //  my=new Regex(@"(\[SIZE=1\])(.[^\[]*)(\[\/SIZE\])",RegexOptions.IgnoreCase);
      //  str=my.Replace(str,@"<font size=1>$2</font>");

      //  my=new Regex(@"(\[SIZE=2\])(.[^\[]*)(\[\/SIZE\])",RegexOptions.IgnoreCase);
       // str=my.Replace(str,@"<font size=2>$2</font>");

       // my=new Regex(@"(\[SIZE=3\])(.[^\[]*)(\[\/SIZE\])",RegexOptions.IgnoreCase);
      //  str=my.Replace(str,@"<font size=3>$2</font>");

       // my=new Regex(@"(\[SIZE=4\])(.[^\[]*)(\[\/SIZE\])",RegexOptions.IgnoreCase);
       // str=my.Replace(str,@"<font size=4>$2</font>");

      //  my=new Regex(@"(\[CENTER\])(.[^\[]*)(\[\/CENTER\])",RegexOptions.IgnoreCase);
       // str=my.Replace(str,@"<center>$2</center>");

        return str;
    }

    public static string TranslateOldBlogUBB(string str)
    {
        str = UbbToHtmlForOldImg(str);
        str = UbbToHtmlForEvenOlderImg(str);
        str = UbbToHtmlForOldAttachment(str);
        str = UbbToHtmlForEvenOlderAttachment(str);
        return str;
    }

    public static string UbbToHtmlForOldImg(string str)
    {
        //Regex my = new Regex(@"(\[IMG\]\[Attach\])(.[^\[]*)\])(\[\/Attach\]\[\/IMG\])", RegexOptions.IgnoreCase);
        Regex my = new Regex(@"(\[img\]\[attach\])(.[^\[]*)(\[\/attach\]\[\/img\])", RegexOptions.IgnoreCase);
        bool a = my.IsMatch(str);
        str = my.Replace(str, "<img src=\"" + BlogURL + "/posts/attachment/$2\" />");

        return str;
    }

    public static string UbbToHtmlForEvenOlderImg(string str)
    {
        //Regex my = new Regex(@"(\[IMG\]\[Attach\])(.[^\[]*)\])(\[\/Attach\]\[\/IMG\])", RegexOptions.IgnoreCase);
        Regex my = new Regex(@"(\[img\]attachment\/+)(.[^\[]*)(\[\/img\])", RegexOptions.IgnoreCase);
        bool a = my.IsMatch(str);
        str = my.Replace(str, "<img src=\"" + BlogURL + "/attachment/$2\" />");

        return str;
    }

    public static string UbbToHtmlForOldAttachment(string str)
    {
        Regex my = new Regex(@"(\[file\]\[attach\])(.[^\[]*)(\[\/attach\]\[\/file\])", RegexOptions.IgnoreCase);
        bool a = my.IsMatch(str);
        MatchCollection matches = my.Matches(str);
        foreach(Match m in matches)
        {
            string fn = HttpUtility.UrlDecode(new PostRepository().GetAttachmentOriginalNameByID(int.Parse(m.Groups[2].Value)));
            str = str.Replace(m.Value, "<a href=\"" + BlogURL + "/Posts/Attachment/" + m.Groups[2].Value + "\">Click to download: " + fn + "</a>");
        }
        
        //str = my.Replace(str, "<a href=\"" + BlogURL + "/Posts/Attachment/$2\">Click to download</a>");

        return str;
    }

    public static string UbbToHtmlForEvenOlderAttachment(string str)
    {
        Regex my = new Regex(@"(\[s*file\])(.[^\[]*)(\[\/s*file\])", RegexOptions.IgnoreCase);
        bool a = my.IsMatch(str);
        MatchCollection matches = my.Matches(str);
        foreach (Match m in matches)
        {
            string fielPath = m.Groups[2].Value;
            str = str.Replace(m.Value, "<a href=\"" + BlogURL + "/" + fielPath + "\">Click to download: " + fielPath.Substring(fielPath.LastIndexOf('/') + 1) + "</a>");
        }

        //str = my.Replace(str, "<a href=\"" + BlogURL + "/Posts/Attachment/$2\">Click to download</a>");

        return str;
    }

    /// <summary>
    /// 将HTML内容转换成纯文本形式，即去除HTML格式，但是保留空格(&nbsp;)。
    /// </summary>
    /// <param name="source"></param>
    /// <returns></returns>
    public static string ConvertToPlainText(string source)
    {
        string result;            
        
        //remove line breaks,tabs
        result = source.Replace("\r", " ");
        result = result.Replace("\n", " ");
        result = result.Replace("\t", " ");

        //remove the header
        result = Regex.Replace(result, "(<head>).*(</head>)", string.Empty, RegexOptions.IgnoreCase);

        result = Regex.Replace(result, @"<( )*script([^>])*>", "<script>", RegexOptions.IgnoreCase);
        result = Regex.Replace(result, @"(<script>).*(</script>)", string.Empty, RegexOptions.IgnoreCase);

        //remove all styles
        result = Regex.Replace(result, @"<( )*style([^>])*>", "<style>", RegexOptions.IgnoreCase); //clearing attributes
        result = Regex.Replace(result, "(<style>).*(</style>)", string.Empty, RegexOptions.IgnoreCase);

        //insert tabs in spaces of <td> tags
        result = Regex.Replace(result, @"<( )*td([^>])*>", " ", RegexOptions.IgnoreCase);

        //insert line breaks in places of <br> and <li> tags
        result = Regex.Replace(result, @"<( )*br( )*>", "\r", RegexOptions.IgnoreCase);
        result = Regex.Replace(result, @"<( )*li( )*>", "\r", RegexOptions.IgnoreCase);

        //insert line paragraphs in places of <tr> and <p> tags
        result = Regex.Replace(result, @"<( )*tr([^>])*>", "\r\r", RegexOptions.IgnoreCase);
        result = Regex.Replace(result, @"<( )*p([^>])*>", "\r\r", RegexOptions.IgnoreCase);

        //remove anything thats enclosed inside < >
        result = Regex.Replace(result, @"<[^>]*>", string.Empty, RegexOptions.IgnoreCase);

        //replace special characters:
        result = Regex.Replace(result, @"&", "&", RegexOptions.IgnoreCase);
        result = Regex.Replace(result, @" ", " ", RegexOptions.IgnoreCase);
        result = Regex.Replace(result, @"<", "<", RegexOptions.IgnoreCase);
        result = Regex.Replace(result, @">", ">", RegexOptions.IgnoreCase);
        //保留空格
        result = Regex.Replace(result, @"&(.{2,6});", " ", RegexOptions.IgnoreCase);

        //remove extra line breaks and tabs
        result = Regex.Replace(result, @" ( )+", " ");
        result = Regex.Replace(result, "(\r)( )+(\r)", "\r\r");
        result = Regex.Replace(result, @"(\r\r)+", "\r\n");

        //remove blank
        //result = Regex.Replace(result, @"\s", "");

        return result;
    }

    public static string GetSEOFriendlyURL(string slug)
    {
        if (String.IsNullOrEmpty(slug)) return "";

        // to lowercase, trim extra spaces
        slug = slug.ToLower().Trim();

        var len = slug.Length;
        var sb = new StringBuilder(len);
        bool prevdash = false;
        char c;

        for (int i = 0; i < slug.Length; i++)
        {
            c = slug[i];
            if (c == ' ' || c == ',' || c == '.' || c == '/' || c == '\\' || c == '-')
            {
                if (!prevdash)
                {
                    sb.Append('-');
                    prevdash = true;
                }
            }
            else if ((c >= 'a' && c <= 'z') || (c >= '0' && c <= '9') || (c >=19968 && c <= 40869))
            {
                sb.Append(c);
                prevdash = false;
            }
            if (i == 80) break;
        }

        slug = sb.ToString();
        // remove trailing dash, if there is one
        if (slug.EndsWith("-"))
            slug = slug.Substring(0, slug.Length - 1);
        return slug;
    }

}

